{"id":107121,"date":"2026-04-17T12:49:17","date_gmt":"2026-04-17T10:49:17","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=107121"},"modified":"2026-07-20T12:26:21","modified_gmt":"2026-07-20T10:26:21","slug":"televue-ethos-17mm-100-degree-eyepiece","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-ethos-17mm-100-2-oculair\/","title":{"rendered":"TeleVue Ethos 17mm \u2013 100\u00b0 2\" Eyepiece"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>TeleVue Ethos 17mm : 100\u00b0 2\" Oculair: Ethos-oculair met 100 graden beeldveld<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">De Ethos 17 mm opent de reeks 17, 10 en 6 mm en is het laagste vergrotingsmodel dat nog met een matige lichtvervuiling overweg kan. Met een veldstop van 29,6 mm ligt het ware beeldveld dicht bij dat van een 26 mm Nagler, maar bij een hogere vergroting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dit is een 2 inch oculair. Een focuser of zenitspiegel met 2 inch aansluiting is dus voorwaarde.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-17mm-2-.jpg\" alt=\"TeleVue Ethos 17mm : 100\u00b0 2\" title=\"\"><\/figure><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">What a 100-degree field of view does<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A classic Ploessl has 50 degrees, a Nagler has 82 degrees. At 100 degrees, your eye can no longer take in the field at once: you\u2019re looking around the image instead of *at* it. That\u2019s the effect the Ethos series is known for.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Practically, this also means that objects remain in view for longer. On a manually tracked Dobson, this saves constant readjustment.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Overzicht met een donkere achtergrond<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bij lage vergroting wordt de hemelachtergrond lichter, zeker onder een stedelijke hemel. Doordat de Ethos hetzelfde ware beeldveld haalt bij een hogere vergroting, blijft de achtergrond donkerder en komt zwakke nevelstructuur beter uit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voor uitgestrekte objecten als de Noord-Amerikanevel of de Plejaden is dit het model dat overzicht en contrast combineert.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Viewing Comfort and Dioptrx<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The eye relief is 15 mm at every focal length in the series. The height of the foldable eyecup is adjustable, so your eye is always in the same position.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you wear glasses due to astigmatism, you can replace them with Dioptrx on the eyepiece. This corrects your own cylindrical aberration without the eyeglass lenses costing contrast and eye distance.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">In your telescope<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">In een telescoop met een brandpuntsafstand van 1200 mm levert dit oculair ongeveer 71x met een waar beeldveld van circa 1,41 graden. Je rekent dat voor je eigen telescoop uit met de veldstop: waar beeldveld = 57,3 x veldstop gedeeld door de brandpuntsafstand van de telescoop.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">De veldstop van dit model is 29,6 mm. Dat getal, en niet de brandpuntsafstand alleen, bepaalt hoeveel hemel je werkelijk ziet.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Included<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Foldable rubber eyecup<\/li><li>Eyecup protector<\/li><li>Dust cover for the stitch<\/li><li>Filter thread abandoned<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Featured accessories<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Every Ethos eyepiece is compatible with the TeleVue Dioptrx, a corrector for astigmatism that allows you to observe without glasses. If you\u2019re using a fast Newtonian, the Paracorr coma corrector will bring out that last bit of edge sharpness. For a 2-inch focuser, an Everbrite zenith mirror is the logical addition, and an eyepiece case protects your investment while on the go.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For whom yes and for whom no<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>\u2713 Grote nevels en open sterrenhopen<\/li><li>\u2713 Waarnemen onder een niet volledig donkere hemel<\/li><li>\u2713 Telescopen met een 2 inch focuser<\/li><li>\u2717 Focusers met alleen een 1,25 inch aansluiting<\/li><li>\u2717 Wie een licht oculair nodig heeft<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Focal length<\/strong><\/td><td>17 mm<\/td><\/tr><tr><td><strong>Apparent field of view<\/strong><\/td><td>100 degrees<\/td><\/tr><tr><td><strong>Effective field stop<\/strong><\/td><td>29,6 mm<\/td><\/tr><tr><td><strong>Eye distance<\/strong><\/td><td>15 mm<\/td><\/tr><tr><td><strong>Stitch gauge<\/strong><\/td><td>2 inches<\/td><\/tr><tr><td><strong>Filter thread<\/strong><\/td><td>Yes<\/td><\/tr><tr><td><strong>Dioptrx-compatible<\/strong><\/td><td>Yes<\/td><\/tr><tr><td><strong>Coating<\/strong><\/td><td>Fully multi-coated, blackened lens edges<\/td><\/tr><tr><td><strong>Eyecup<\/strong><\/td><td>Foldable, with protective cap<\/td><\/tr><tr><td><strong>Weight<\/strong><\/td><td>circa 700 g<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">All wide-angle eyepieces are on the <a href=\"\/en\/telescope-accessories\/eyepieces-and-barlows\/wide-angle-eyepieces-wide-field\/\">page featuring wide-field eyepieces<\/a>. You can find the complete selection of this merk on the <a href=\"\/en\/brands\/televue\/\">TeleVue merk Page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ethos-oculair van 17 mm met 100 graden beeldveld en 2 inch steek, voor overzicht met contrast.<\/p>","protected":false},"featured_media":107122,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1551],"product_cat":[3129,56,3131],"product_tag":[],"class_list":["post-107121","product","type-product","status-publish","has-post-thumbnail","product_brand-televue","product_cat-oculairs-en-barlows","product_cat-telescoop-accessoires","product_cat-groothoek-oculairen-wide-field","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[107666],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":107545,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-10mm-100-oculair\/","url_meta":{"origin":107121,"position":0},"title":"TeleVue Ethos 10mm 100\u00b0 \u2013 Eyepiece","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"Ethos-ocular 10mm with a 100-degree field of view and dual barrel sizes of 1.25 and 2 inches.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Oculair Ethos 10mm 1,25\"\/2\" productfoto van het Ethos 10 mm oculair met groene opschriftring, gekartelde grip en zilverkleurige 2 inch skirt op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-10mm-1-25-2-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-10mm-1-25-2-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-10mm-1-25-2-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-10mm-1-25-2-.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107358,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-6mm-6-mm-xwa-oculair\/","url_meta":{"origin":107121,"position":1},"title":"TeleVue Ethos 6mm - 6mm XWA Eyepiece","author":"Abdullah Ibrar","date":"21-04-2026","format":false,"excerpt":"Ethos-oculair van 6 mm met 100 graden beeldveld en dubbele steekmaat van 1,25 en 2 inch.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Oculair Ethos 6mm 1,25\"\/2\" close-up productfoto van het oculair met groene opschriftband en metalen vatting","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-6mm-1-25-2-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-6mm-1-25-2-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-6mm-1-25-2-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-6mm-1-25-2-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107124,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-21mm-100-2-oculair\/","url_meta":{"origin":107121,"position":2},"title":"TeleVue Ethos 21mm - 100\u00b0 2\" Eyepiece","author":"Abdullah Ibrar","date":"17-04-2026","format":false,"excerpt":"Ethos-ocular with 21 mm and 100-degree field of view, and the largest true field of view in the series.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Oculair Ethos 21mm 2\" close-up van het zwarte Ethos 21 mm oculair met groene 100\u00b0 opdruk en geribbelde gripring","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-21mm-2-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-21mm-2-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-21mm-2-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-21mm-2-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107527,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-8mm-oculair\/","url_meta":{"origin":107121,"position":3},"title":"TeleVue Ethos 8mm \u2013 Eyepiece","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"Ethos-oculair van 8 mm met 100 graden beeldveld, licht en geschikt voor binoviewers.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Oculair Ethos 8mm 1,25\"\/2\" productfoto van het Ethos 8 mm oculair met groene opschriftring en zilverkleurige 2 inch skirt op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-8mm-1-25-2-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-8mm-1-25-2-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-8mm-1-25-2-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-8mm-1-25-2-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107546,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-13mm-100-oculair\/","url_meta":{"origin":107121,"position":4},"title":"TeleVue Ethos 13mm 100\u00b0 \u2013 Eyepiece","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"Ethos-oculair van 13 mm met 100 graden beeldveld, het meest veelzijdige model uit de serie.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Oculair Ethos 13mm 1,25\"\/2\" productfoto van het Ethos 13 mm oculair met groene opschriftring en zilverkleurige 2 inch skirt op witte achtergrond","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-13mm-1-25-2-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-13mm-1-25-2-3.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-13mm-1-25-2-3.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Oculair-Ethos-13mm-1-25-2-3.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107537,"url":"https:\/\/www.telescoop.nl\/en\/televue-ethos-47mm-110-oculair\/","url_meta":{"origin":107121,"position":5},"title":"TeleVue Ethos 4.7mm 110\u00b0 - 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